The Maven Plugin Tools contains the necessary tools to generate
rebarbative content like descriptor, help and documentation. In addition,
it provides tools to write Maven Plugins in scripting languages like Ant
or Beanshell.

The Maven Plugin Plugin is used to create a Maven plugin descriptor for
any Mojo’s found in the source tree, to include in the JAR. It is also
used to generate report files for the Mojos as well as for updating the
plugin registry, the artifact metadata and generating a generic help goal.